Sound spot generation by 128-channel surrounded speaker array

Indoor sound field feature matching for robot’s location and orientation detection

“…Therefore, a directional sound emission approach must be designed. To realize a directional sound pattern, the idea of speaker array beamforming (Tamai et al, 2004b;Yamada et al, 2004) is adopted in this work to guarantee the directivity of the generated sound pattern. Besides directivity, another constraint on the generated sound pattern is the number of symmetric axes (b) in the horizontal plane.…”

Simultaneous generation of various shaped Sound Spots with multiple linear speaker arrays

“…The generation of the Sound Spot with the loudspeaker arrays is achieved by using the Sum and Delay Beam Former (SDBF) [1] method. Fig.2 is principle figure of the loudspeaker arrays.…”

“…Kyosuke Horio 1 , Yuuki Ohtomo 2 , Hiroshi Takemura 3 and Hiroshi Mizoguchi 4 1 Department of Mechanical Engineering, Tokyo University of Science. Chiba, Japan (Tel : +81-4-7124-1501; E-mail: j7507651@ed.noda.tus.ac.jp)…”

“…For such merit, it is useful for the machine to give aural voice information to put the approach to person who do not notice them. Then, "Loudspeaker arrays system [1] (Fig.1)" is researched as a transmission means of voice information from the machine to person. The loudspeaker arrays system forms a spot-like small area of high sound pressure level (hereafter called Sound Spot) only at a specific position such as person's heads.…”

Implementation of luggable linear speaker array system and formation of Sound Spot

“…The some lines loudspeaker arrays can form a sound spot in a focus. It is because the appropriate attenuation and the delay for each loudspeaker are given [2]. Fig.1 shows the orthogonality three lines loudspeaker arrays system.…”